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Basis of preparation and accounting policies - Distribution rights (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Assets subject to impairment estimates      
Distribution rights $ 3,824 $ 3,986 $ 3,884
Distribution rights      
Assets subject to impairment estimates      
Distribution rights $ 3,559 $ 3,709 $ 3,630